package cuoti;

public class Example {
    String str = new String("good");
    char[ ] ch = { 'a' , 'b' , 'c' };
    public static void main(String args[]){
        Example ex = new Example();
        ex.change(ex.str,ex.ch);
        System.out.print(ex.str + " and ");//good and gbc
        System.out.print(ex.ch);
    }
    public void change(String str,char ch[ ]){
        str = "test ok";//改的是形参的引用，不影响实参
        ch[0] = 'g';//改的是对象
    }
}
